Wristwatch



FIG. 1 is a top plan view of my improved design for a wristwatch;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an end elevational view thereof; and,

FIG. 6 is an opposite end elevational view thereof. 

The ornamental design for "wristwatch", as shown and described. 